| |||
视频数据 | |||
视频资料 |
video data : 45 phrases in 12 subjects |
Air defense | 2 |
Aviation | 1 |
Chemistry | 1 |
Communications | 1 |
Earth sciences | 1 |
Electronics | 19 |
Information technology | 2 |
Metallurgy | 1 |
Oil / petroleum | 1 |
Space | 10 |
Technology | 3 |
Telecommunications | 3 |